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-<!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
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- </p>
- <p>
- The disclaimer of warranties and limitation of liability provided
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-
-</body>
-</html>
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