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-% Development notes (old/obsolete notes) 
-
-For current notes, see [](./).
-
-These are old (obsolete) notes that mare kept because they might become
-useful again in the future.
-
-Table of contents
-=================
-
--   [X60 native graphics initialization (backlight
-    controls)](#x60_native_notes)
-
--   [T60 native graphics initialization (backlight
-    controls)](#t60_native_notes)
--   [i945: 3D fix (based on 5927) for kernel 3.12+ on
-    5320](#5320_kernel312fix)
--   [i945/x60: coreboot 5927 testing (3D fix for kernel 3.12+ on replay
-    code)](#x60_cb5927_testing)
-
-X60 native graphics initialization (with backlight controls) {#x60_native_notes}
-============================================================
-
-**This is now obsolete. A better way was found (included in libreboot):
-<http://review.coreboot.org/#/c/6731/>**
-
-***Also check [\#5320\_kernel312fix](#5320_kernel312fix) (to fix 3D on
-kernel 3.12/higher)***
-
-**The fix below was done on 5320/6 (from review.coreboot.org) but should
-work just fine on later versions of 5320.**
-
-Native gpu init + backlight controls! (Fn keys). Also confirmed on X60
-Tablet (1024x768) and X60 Tablet (1400x1050)
-
-**Add backlight controls:** in *src/mainboard/lenovo/x60/devicetree.cb*,
-change **gpu\_backlight** to **0x879F879E**
-
-That's all! **This has also been backported into libreboot 5th release
-(line 1233 in src/mainboard/lenovo/x60/i915io.c)**. GNUtoo (Denis
-Carikli) told me about the register **BLC\_PWM\_CTL** and that you could
-set it to control backlight. I read that address using devmem2 while
-running the VBIOS:
-
-    # devmem2 0xe4361254 w
-
-The change is also included in libreboot 6.
-
-When doing this, it gave back that value. The same trick was used to get
-backlight controls for T60 (see
-[\#t60\_native\_notes](#t60_native_notes)).
-
-Further notes
--------------
-
-Reading **0xe4361254** (address) in Lenovo BIOS always yields FFFFFFFF,
-even when writing to it (and writing to it doesn't affect brightness
-controls). 'mtjm' on IRC found that the buttons (Fn keys) control
-/sys/class/backlight/acpi\_video0 which has no affect on 61254
-(BLC\_PWM\_CTL). This person says intel\_backlight has different values
-and uses the register. devmem2 works, needs checking **lspci -vv** for
-where the memory is mapped, which is different than on coreboot; mtjm
-found that it was 0xec061254 on his system (X60 Tablet), and the
-register value is different too. **This is relevant, because we still
-don't know how backlight controls are actually handled. We got it
-working by accident. We need to know more.**.
-
-Intel-gpu-tools may prove useful for further debugging:
-<http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/>
-
-mtjm says 0xe4300000 is an MMIO region of the gpu (lspci -vv shows it),
-0x61254 (BLC\_PWM\_CTL) is a documented register. Searching the kernel
-driver for backlight shows that in intel\_panel.c this register is used
-(there is an XXX comment about finding the right value, where recent
-kernels get it from.
-
-What we want to do is calculate a good value, instead of setting it in
-devicetree.cb. mtjm says about backlight physics: it has a light source
-, uses pulse width modulation (PWM) to turn it on/off, dimming is done
-by spending less time on. **Note: this may not be correct; this person
-says that their understanding is based on how the Lenote yeeloong
-works**.
-
-mtjm goes on to say, that the register specifies the frequency used for
-PWM in its depending on the GPU core frequency, so it might be possible
-to calculate it without hardcoded laptop-specific values. Therefore, I
-am supposed to find out the 'display core frequency' (mtjm says there
-might be a register for it; also, it might be in 5320 or the replay
-code) and the PWM modulation frequency.
-https://en.wikipedia.org/wiki/Backlight\#Flicker\_due\_to\_backlight\_dimming
-
-phcoder (Vladimir Serbinenko) who is author of 5320
-(review.coreboot.org) talks about 'duty cycle limit' and 'flickering
-frequency'.
-
-[Back to top of page](#pagetop)
-
-T60 native graphics initialization (with backlight controls) {#t60_native_notes}
-============================================================
-
-**This is now obsolete. A better way was found (included in libreboot):
-<http://review.coreboot.org/#/c/6731/>**
-
-***Also check [\#5320\_kernel312fix](#5320_kernel312fix) (to fix 3D on
-kernel 3.12/higher)***
-
-**The fix below was done on an earlier version of 5345 changeset
-(review.coreboot.org), but should work on the current version. it is
-included in libreboot 6**
-
-**Add backlight controls:** in *src/mainboard/lenovo/t60/devicetree.cb*,
-change **gpu\_backlight** to **0x58BF58BE**
-
-Hold on! Check
-[../misc/\#get\_edid\_panelname](../misc/#get_edid_panelname) to know
-what LCD panel you have. This is important for the next step!
-
-Supported panels
-----------------
-
-[../hcl/\#supported\_t60\_list](../hcl/#supported_t60_list).
-
-See [\#lcd\_i945\_incompatibility](./#lcd_i945_incompatibility).
-
-[Back to top of page](#pagetop)
-
-i945: 3D fix (based on 5927) for kernel 3.12+ on 5320 {#5320_kernel312fix}
-=====================================================
-
-**This is now obsolete. Merged in coreboot:
-<http://review.coreboot.org/#/c/5927/>**
-
-**This needs to be rewritten (or better organized, or deleted?)**. This
-is also now included in libreboot 6 (using the proper way, not the
-7c0000 method which was a hack)
-
-**This was done on 5320/6 so far. The fix below is for 5320/6 which is
-now obsolete. This needs to be re-done for the latest version of 5320.
-The fix below is (in practise) only for reference, therefore.**
-
-See [\#x60\_cb5927\_testing](#x60_cb5927_testing) for the original (and
-current) fix, for the replay code. Now we want to implement that on top
-of <http://review.coreboot.org/#/c/5320> which is the current code for
-native graphics initialization on i945.
-
-src/northbridge/intel/i945/gma.c (using the 7c0000 hack) on 5320:
-[5320\_7c0000\_gma.c](dumps/5320_7c0000_gma.c) (rename it to gma.c,
-replacing the current one).
-
-The above is a hack (as is the original). A better (more correct) method
-is implemented in later versions of 5927, so that should also be adapted
-for 5320. For now, you can use the above fix.
-
-The correct way to do it is to set gtt address to (end of stolen memory
-- gtt size), which is what later versions of 5927 do (successfully).
-
-Here is some debugging output using intel\_gpu\_tools v1.2-1 (from
-apt-get repositories) using tool "intel\_gtt":
-
--   kernel 3.14.4:
-    -   with libreboot 5th release (using the 7c0000 gtt hack from
-        5927/3): <http://paste.debian.net/104306>
-    -   with coreboot+vgarom: <http://paste.debian.net/104309>
--   kernel 3.2.0-60 (from apt-get repositories):
-    -   with coreboot (no vbios or native init):
-        <http://paste.debian.net/104341>
-
-[Back to top of page](#pagetop)
-
-i945/X60: Coreboot 5927 testing (3D fix for kernel 3.12+ on replay code) {#x60_cb5927_testing}
-========================================================================
-
-**This is now obsolete. Merged in coreboot:
-<http://review.coreboot.org/#/c/5927/>**
-
-**The latest version as-is (5927/11) has not been tested by me yet.
-Always boot with 'drm.debug=0x06' kernel parameter when testing
-this.**
-
-This is the fix for 3D on kernel 3.12 and higher on i945 (ThinkPad X60
-in this case). This is for the replay code. Libreboot 5th release has a
-version of this backported already (based on 5927/3 using the '7c0000'
-hack).
-
-**The replay code is obsolete (see 5320 changeset on review.coreboot.org
-for better version which supports more systems/screens, and then 5345
-for T60). Information here for reference since that is where the fix was
-first applied.**
-
-Read the information on <http://review.coreboot.org/#/c/5927/>.
-
-For historical purposes, here is a collection of IRC logs that once
-existed on this page, related to the issue:
-[kernel312\_irc](dumps/kernel312_irc).
-
-PGETBL\_CTL differs between VBIOS (-) and native graphics init (+).\
-- PGETBL\_CTL: 0x3ffc0001\
-+ PGETBL\_CTL: 0x3f800001
-
-GTT (graphics translation table) size is PGETBL\_save, max 256 KiB. BSM
-(Base of Stolen Memory) is given by the bios.
-
--   5927/7: [5927\_7.tar.gz](dumps/5927_7.tar.gz) (GRUB graphics are
-    correct now, and 3D still works)
--   5927/6: [5927\_6.tar.gz](dumps/5927_6.tar.gz) (GRUB graphics still
-    corrupt, 3D/everything still works after GRUB)
--   5927/5: [5927\_5.tar.gz](dumps/5927_5.tar.gz) (GRUB graphics
-    corrupt, 3D/everything still works after GRUB)
--   5927/3: [5927\_3.tar.gz](dumps/5927_3.tar.gz) (3D still works!
-    kernel 3.14.4) - the '7c0000' hack
--   5927/2: [5927\_2.tar.gz](dumps/5927_2.tar.gz) (3D works! kernel
-    3.14.4) - the '7c0000' hack
--   5927/1 (didn't fix the 3D issue):
-    -   [cbmem -c](dumps/5927_cbmemc)
-    -   [/sys/class/drm/card0/error](dumps/5927_crashdump)
-    -   [.config](dumps/5927_config)
-
-[Back to top of page](#pagetop)
-
-Copyright © 2014, 2015 Leah Rowe <info@minifree.org>\
-This page is available under the [CC BY SA 4.0](../cc-by-sa-4.0.txt)