[Bug 49688] [GM965/GL960] blank screen after switching between VGA1 and LVDS1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49688

max <manikulin at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #43 from max <manikulin at gmail.com> ---
3.12.0-994-generic #201311220431 SMP Fri Nov 22 09:32:00 UTC 2013 x86_64 x86_64
x86_64 GNU/Linux
(ubuntu mainline drm-intel-nightly *x86_64*)
Ubuntu-13.10

The problem with dark screen persists.

Many warning in dmesg
[   22.266431] [drm] initialized overlay support
[   22.293106] fbcon: inteldrmfb (fb0) is primary device
[   22.316061] ------------[ cut here ]------------
[   22.316120] WARNING: CPU: 0 PID: 363 at
/home/apw/COD/linux/drivers/gpu/drm/i
915/intel_panel.c:792 intel_panel_enable_backlight+0xe0/0xf0 [i915]()
[   22.316145] Modules linked in: ath9k_hw snd_seq_device bnep snd_timer rfcomm 
ath microcode(+) snd mac80211 i915(+) btusb cfg80211 drm_kms_helper bluetooth
ps
mouse drm serio_raw soundcore lp parport asus_laptop lpc_ich i2c_algo_bit
sparse
_keymap input_polldev mac_hid video hid_a4tech usbhid hid ahci libahci r8169
mii
[   22.316149] CPU: 0 PID: 363 Comm: systemd-udevd Not tainted
3.12.0-994-generi
c #201311220431
[   22.316151] Hardware name: ASUSTeK Computer Inc.         F80L                
/F80L      , BIOS 206     08/06/2008
[   22.316155]  0000000000000318 ffff88007a0bd468 ffffffff81742f52
0000000000000
086
[   22.316158]  0000000000000000 ffff88007a0bd4a8 ffffffff8106783c
0000000000000
282
[   22.316160]  ffff880078d41800 ffff88007b238000 ffff88007b23a19c
0000000000000
246
[   22.316161] Call Trace:
[   22.316171]  [<ffffffff81742f52>] dump_stack+0x46/0x58
[   22.316175]  [<ffffffff8106783c>] warn_slowpath_common+0x8c/0xc0


http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/2013-11-16-trusty/
*i386* + kubuntu 13.04
The problem with dark screen persists (mainly with VGA1)
Many warnings with call traces in dmesg.
After several switches LVDS1<->VGA1  X server failed, image in text console did
not update (frozen).

So the bug has not been fixed.
The recent kernel have serious problems with GM965/GL960.
Unfortunately it is unlikely that I will be able to file bugs and test fixes in
the near future.

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