actually add the documentation directory. (I forgot git add in last commit)

author: Leah Rowe <info@minifree.org> 2016-08-22 10:22:04 +0100
committer: Leah Rowe <info@minifree.org> 2016-08-22 10:22:04 +0100
commit: c679b19f0b0d95f587b3836c7bf867a932d3df28 (patch)
tree: a0529135e5901b3aff16987a2cf94c10752cb8ab /docs/hcl/gm45_lcd.html
parent: 3ca295f25340344f5d42164bd134dbb9f5b0ff4c (diff)
download: librebootfr-c679b19f0b0d95f587b3836c7bf867a932d3df28.tar.gz
librebootfr-c679b19f0b0d95f587b3836c7bf867a932d3df28.zip
1 files changed, 366 insertions, 0 deletions
diff --git a/docs/hcl/gm45_lcd.html b/docs/hcl/gm45_lcd.html
new file mode 100644
index 00000000..32816a89
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@@ -0,0 +1,366 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1">
+
+	<style type="text/css">
+		@import url('../css/main.css');
+	</style>
+
+	<title>LCD compatibility on GM45 laptops</title>
+</head>
+
+<body>
+
+	<div class="section">
+		<h1 id="pagetop">LCD compatibility on GM45 laptops</h1>
+			
+			<p>
+				On the T400 and T500 (maybe others), some of the higher resolution panels
+				(e.g. 1440x900, 1680x1050, 1920x1200) fail in libreboot.
+			</p>
+
+			<p>
+				<b>All X200/X200S/X200T LCD panels are believed to be compatible.</b>
+			</p>
+			
+			<p>
+				<a href="index.html">Back to previous index</a>.
+			</p>
+	</div>
+
+	<div class="section">
+		<h1>The problem</h1>
+			<p>
+				In some cases, backlight turns on during boot, sometimes not. In all cases,
+				no display is shown in GRUB, nor in GNU/Linux.
+			</p>
+		<h1>
+			Current workaround:
+		</h1>
+			<p>
+				Libreboot (git, and releases after 20150518) now automatically detect whether
+				to use single or dual link LVDS configuration. If you're using an older version,
+				use the instructions below. In practise, this means that you'll get a visual
+				display when booting GNU/Linux, but not in GRUB (payload).
+			</p>
+
+			<p>
+				The i915 module in the Linux kernel also provides an option to set the LVDS link configuration.
+				i915.lvds_channel_mode:Specify LVDS channel mode (0=probe BIOS [default], 1=single-channel, 2=dual-channel) (int)
+				- from /sbin/modinfo i915 - use <b>i915.lvds_channel_mode=2</b> as a kernel option in grub.cfg.
+			</p>
+	</div>
+
+	<div class="section">
+		<h1>Differences in dmesg (kernel parameter added: )</h1>
+			<p>
+				<a href="https://01.org/linuxgraphics/documentation/how-report-bugs">https://01.org/linuxgraphics/documentation/how-report-bugs</a>
+			</p>
+			<p>
+				These panels all work in the original firmware, so the idea is to see what differences there are in how coreboot handles them.
+			</p>
+			<p>
+				<a href="http://www.coreboot.org/pipermail/coreboot/attachments/20150712/d2e214bb/attachment-0002.txt">dmesg with coreboot-libre</a> (coreboot) - 
+				See: <i>[drm:intel_lvds_init] detected single-link lvds configuration</i>
+			</p>
+			<p>
+				<a href="http://www.coreboot.org/pipermail/coreboot/attachments/20150712/d2e214bb/attachment-0003.txt">dmesg with lenovobios</a> (lenovobios) - 
+				For the same line, it says dual-channel lvds configuration.
+			</p>
+	</div>
+	
+	<div class="section">
+
+		<h2 id="edid">EDID</h2>
+
+		<p>
+			One T500 had a screen (1920x1200) that is currently incompatible. Working to fix it. EDID:
+		</p>
+<pre>
+user@user-ThinkPad-T500:~/Desktop$ sudo i2cdump -y 2 0x50
+No size specified (using byte-data access)
+     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
+00: XX ff ff ff ff ff ff 00 30 ae 55 40 00 00 00 00    X.......0?U@....
+10: 00 11 01 03 80 21 15 78 ea ba 70 98 59 52 8c 28    .????!?x??p?YR?(
+20: 25 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01    %PT...??????????
+30: 01 01 01 01 01 01 e7 3a 80 8c 70 b0 14 40 1e 50    ???????:??p??@?P
+40: 24 00 4b cf 10 00 00 19 16 31 80 8c 70 b0 14 40    $.K??..??1??p??@
+50: 1e 50 24 00 4b cf 10 00 00 19 00 00 00 0f 00 d1    ?P$.K??..?...?.?
+60: 0a 32 d1 0a 28 11 01 00 32 0c 00 00 00 00 00 fe    ?2??(??.2?.....?
+70: 00 4c 50 31 35 34 57 55 31 2d 54 4c 42 31 00 9a    .LP154WU1-TLB1.?
+80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+</pre>
+		<p>
+			What happens: backlight turns on at boot, then turns off. At no point is there
+			a working visual display.
+		</p>
+
+		<p>
+			Another incompatible screen (EDID) 1680 x 1050 with the same issue:
+		</p>
+<pre>
+EDID:
+00 ff ff ff ff ff ff 00 30 ae 53 40 00 00 00 00 
+00 11 01 03 80 21 15 78 ea cd 75 91 55 4f 8b 26 
+21 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01 
+01 01 01 01 01 01 a8 2f 90 e0 60 1a 10 40 20 40 
+13 00 4b cf 10 00 00 19 b7 27 90 e0 60 1a 10 40 
+20 40 13 00 4b cf 10 00 00 19 00 00 00 0f 00 b3 
+0a 32 b3 0a 28 14 01 00 4c a3 50 33 00 00 00 fe 
+00 4c 54 4e 31 35 34 50 33 2d 4c 30 32 0a 00 7e 
+Extracted contents:
+header:          00 ff ff ff ff ff ff 00
+serial number:   30 ae 53 40 00 00 00 00 00 11
+version:         01 03
+basic params:    80 21 15 78 ea
+chroma info:     cd 75 91 55 4f 8b 26 21 50 54
+established:     00 00 00
+standard:        01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
+descriptor 1:    a8 2f 90 e0 60 1a 10 40 20 40 13 00 4b cf 10 00 00 19
+descriptor 2:    b7 27 90 e0 60 1a 10 40 20 40 13 00 4b cf 10 00 00 19
+descriptor 3:    00 00 00 0f 00 b3 0a 32 b3 0a 28 14 01 00 4c a3 50 33
+descriptor 4:    00 00 00 fe 00 4c 54 4e 31 35 34 50 33 2d 4c 30 32 0a
+extensions:      00
+checksum:        7e
+
+Manufacturer: LEN Model 4053 Serial Number 0
+Made week 0 of 2007
+EDID version: 1.3
+Digital display
+Maximum image size: 33 cm x 21 cm
+Gamma: 220%
+Check DPMS levels
+DPMS levels: Standby Suspend Off
+Supported color formats: RGB 4:4:4, YCrCb 4:2:2
+First detailed timing is preferred timing
+Established timings supported:
+Standard timings supported:
+Detailed timings
+Hex of detail: a82f90e0601a1040204013004bcf10000019
+Did detailed timing
+Detailed mode (IN HEX): Clock 122000 KHz, 14b mm x cf mm
+               0690 06b0 06f0 0770 hborder 0
+               041a 041b 041e 042a vborder 0
+               -hsync -vsync 
+Hex of detail: b72790e0601a1040204013004bcf10000019
+Detailed mode (IN HEX): Clock 122000 KHz, 14b mm x cf mm
+               0690 06b0 06f0 0770 hborder 0
+               041a 041b 041e 042a vborder 0
+               -hsync -vsync 
+Hex of detail: 0000000f00b30a32b30a281401004ca35033
+Manufacturer-specified data, tag 15
+Hex of detail: 000000fe004c544e31353450332d4c30320a
+ASCII string: LTN154P3-L02
+Checksum
+Checksum: 0x7e (valid)
+WARNING: EDID block does NOT fully conform to EDID 1.3.
+        Missing name descriptor
+        Missing monitor ranges
+bringing up panel at resolution 1680 x 1050
+Borders 0 x 0
+Blank 224 x 16
+Sync 64 x 3
+Front porch 32 x 1
+Spread spectrum clock
+Single channel
+Polarities 1, 1
+Data M1=2132104, N1=8388608
+Link frequency 270000 kHz
+Link M1=236900, N1=524288
+Pixel N=9, M1=24, M2=8, P1=1
+Pixel clock 243809 kHz
+waiting for panel powerup
+panel powered up
+</pre>
+
+		<p>
+			Another incompatible (T400) screen:
+		</p>
+<pre>
+No size specified (using byte-data access)
+     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
+00: XX ff ff ff ff ff ff 00 30 ae 33 40 00 00 00 00    X.......0?3@....
+10: 00 0f 01 03 80 1e 13 78 ea cd 75 91 55 4f 8b 26    .??????x??u?UO?&amp;
+20: 21 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01    !PT...??????????
+30: 01 01 01 01 01 01 b0 27 a0 60 51 84 2d 30 30 20    ???????'?`Q?-00 
+40: 36 00 2f be 10 00 00 19 d5 1f a0 40 51 84 1a 30    6./??..????@Q??0
+50: 30 20 36 00 2f be 10 00 00 19 00 00 00 0f 00 90    0 6./??..?...?.?
+60: 0a 32 90 0a 28 14 01 00 4c a3 42 44 00 00 00 fe    ?2??(??.L?BD...?
+70: 00 4c 54 4e 31 34 31 57 44 2d 4c 30 35 0a 00 32    .LTN141WD-L05?.2
+80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+
+</pre>
+
+		<p>
+			For comparison, here is a working display (T400 screen, but was
+			connected to a T500. Some T500 displays also work, but no EDID
+			available on this page yet):
+		</p>
+<pre>
+EDID:
+00 ff ff ff ff ff ff 00 30 ae 31 40 00 00 00 00 
+00 12 01 03 80 1e 13 78 ea b3 85 95 58 53 8a 28 
+25 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01 
+01 01 01 01 01 01 26 1b 00 7d 50 20 16 30 30 20 
+36 00 30 be 10 00 00 18 8b 16 00 7d 50 20 16 30 
+30 20 36 00 30 be 10 00 00 18 00 00 00 0f 00 81 
+0a 32 81 0a 28 14 01 00 30 e4 28 01 00 00 00 fe 
+00 4c 50 31 34 31 57 58 33 2d 54 4c 52 31 00 d8 
+Extracted contents:
+header:          00 ff ff ff ff ff ff 00
+serial number:   30 ae 31 40 00 00 00 00 00 12
+version:         01 03
+basic params:    80 1e 13 78 ea
+chroma info:     b3 85 95 58 53 8a 28 25 50 54
+established:     00 00 00
+standard:        01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
+descriptor 1:    26 1b 00 7d 50 20 16 30 30 20 36 00 30 be 10 00 00 18
+descriptor 2:    8b 16 00 7d 50 20 16 30 30 20 36 00 30 be 10 00 00 18
+descriptor 3:    00 00 00 0f 00 81 0a 32 81 0a 28 14 01 00 30 e4 28 01
+descriptor 4:    00 00 00 fe 00 4c 50 31 34 31 57 58 33 2d 54 4c 52 31
+extensions:      00
+checksum:        d8
+
+Manufacturer: LEN Model 4031 Serial Number 0
+Made week 0 of 2008
+EDID version: 1.3
+Digital display
+Maximum image size: 30 cm x 19 cm
+Gamma: 220%
+Check DPMS levels
+DPMS levels: Standby Suspend Off
+Supported color formats: RGB 4:4:4, YCrCb 4:2:2
+First detailed timing is preferred timing
+Established timings supported:
+Standard timings supported:
+Detailed timings
+Hex of detail: 261b007d502016303020360030be10000018
+Did detailed timing
+Detailed mode (IN HEX): Clock 69500 KHz, 130 mm x be mm
+               0500 0530 0550 057d hborder 0
+               0320 0323 0329 0336 vborder 0
+               -hsync -vsync 
+Hex of detail: 8b16007d502016303020360030be10000018
+Detailed mode (IN HEX): Clock 69500 KHz, 130 mm x be mm
+               0500 0530 0550 057d hborder 0
+               0320 0323 0329 0336 vborder 0
+               -hsync -vsync 
+Hex of detail: 0000000f00810a32810a2814010030e42801
+Manufacturer-specified data, tag 15
+Hex of detail: 000000fe004c503134315758332d544c5231
+ASCII string: LP141WX3-TLR1
+Checksum
+Checksum: 0xd8 (valid)
+WARNING: EDID block does NOT fully conform to EDID 1.3.
+        Missing name descriptor
+        Missing monitor ranges
+bringing up panel at resolution 1280 x 800
+Borders 0 x 0
+Blank 125 x 22
+Sync 32 x 6
+Front porch 48 x 3
+Spread spectrum clock
+Single channel
+Polarities 1, 1
+Data M1=1214600, N1=8388608
+Link frequency 270000 kHz
+Link M1=134955, N1=524288
+Pixel N=10, M1=14, M2=11, P1=1
+Pixel clock 138857 kHz
+waiting for panel powerup
+panel powered up
+</pre>
+
+		<p>
+			Another compatible T400 screen:
+		</p>
+<pre>
+trisquel@trisquel:~$ sudo i2cdump -y 2 0x50
+No size specified (using byte-data access)
+     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
+00: 00 ff ff ff ff ff ff 00 30 ae 31 40 00 00 00 00    ........0?1@....
+10: 00 12 01 03 80 1e 13 78 ea b3 85 95 58 53 8a 28    .??????x????XS?(
+20: 25 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01    %PT...??????????
+30: 01 01 01 01 01 01 26 1b 00 7d 50 20 16 30 30 20    ??????&?.}P ?00 
+40: 36 00 30 be 10 00 00 18 8b 16 00 7d 50 20 16 30    6.0??..???.}P ?0
+50: 30 20 36 00 30 be 10 00 00 18 00 00 00 0f 00 81    0 6.0??..?...?.?
+60: 0a 32 81 0a 28 14 01 00 30 e4 28 01 00 00 00 fe    ?2??(??.0?(?...?
+70: 00 4c 50 31 34 31 57 58 33 2d 54 4c 52 31 00 d8    .LP141WX3-TLR1.?
+80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
+</pre>
+
+	</div>
+
+	<div class="section">
+
+		<p>
+			Copyright &copy;  2015 Leah Rowe &lt;info@minifree.org&gt;<br/>
+			Permission is granted to copy, distribute and/or modify this document
+			under the terms of the GNU Free Documentation License, Version 1.3
+			or any later version published by the Free Software Foundation;
+			with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
+			A copy of the license can be found at <a href="../gfdl-1.3.txt">../gfdl-1.3.txt</a>
+		</p>
+
+		<p>
+			Updated versions of the license (when available) can be found at
+			<a href="https://www.gnu.org/licenses/licenses.html">https://www.gnu.org/licenses/licenses.html</a>
+		</p>
+
+		<p>
+			UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE
+			EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS
+			AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF
+			ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS,
+			IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION,
+			WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR
+			PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS,
+			ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT
+			KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT
+			ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.
+		</p>
+		<p>
+			TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE
+			TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION,
+			NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT,
+			INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES,
+			COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR
+			USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN
+			ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR
+			DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR
+			IN PART, THIS LIMITATION MAY NOT APPLY TO YOU.
+		</p>
+		<p>
+			The disclaimer of warranties and limitation of liability provided
+			above shall be interpreted in a manner that, to the extent
+			possible, most closely approximates an absolute disclaimer and
+			waiver of all liability.
+		</p>
+		
+	</div>
+
+</body>
+</html>
author	Leah Rowe <info@minifree.org>	2016-08-22 10:22:04 +0100
committer	Leah Rowe <info@minifree.org>	2016-08-22 10:22:04 +0100
commit	c679b19f0b0d95f587b3836c7bf867a932d3df28 (patch)
tree	a0529135e5901b3aff16987a2cf94c10752cb8ab /docs/hcl/gm45_lcd.html
parent	3ca295f25340344f5d42164bd134dbb9f5b0ff4c (diff)
download	librebootfr-c679b19f0b0d95f587b3836c7bf867a932d3df28.tar.gz librebootfr-c679b19f0b0d95f587b3836c7bf867a932d3df28.zip