[Bug 74167] [i915] Colors seem inverted on Dell 3737 Laptop IntelHD4400

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74167

--- Comment #7 from Imre Deak <imre.deak at gmail.com> ---
(In reply to comment #6)
> Booting linux with "nomodeset quiet splash" gives me better-looking
> consoles, but no graphical interface. This error briefly flashes on the
> screen:
> 
> ----------
> [   12.193723] [drm:drm_pci_agp_init] *ERROR* Cannot initialize the agpgart
> modu
> le.
> [   12.193796] DRM: Fill_in_dev failed.
> ----------

These are just hallmarks of nomodeset. i915 won't initialize at all with that
option.  

> [   12.278015] HDA driver get symbol successfully from i915 module
> [   12.278021] ------------[ cut here ]------------
> [   12.278050] WARNING: CPU: 2 PID: 78 at
> /build/buildd/linux-3.11.0/drivers/gpu/drm/i915/intel_pm.c:5098
> i915_request_power_well+0x77/0x80 [i915]()
> [   12.278078] Modules linked in: snd_hda_intel(+) snd_hda_codec snd_hwdep
> snd_pcm dell_laptop dcdbas arc4 snd_page_alloc ath9k snd_seq_midi
> snd_seq_midi_event ath9k_common ath9k_hw snd_rawmidi ath snd_seq
> microcode(+) mac80211 i915 ath3k(+) btusb psmouse bluetooth serio_raw
> snd_seq_device drm_kms_helper cfg80211 drm snd_timer mei_me snd i2c_algo_bit
> mei lpc_ich wmi soundcore lp parport mac_hid video ahci r8169 libahci mii
> [   12.278082] CPU: 2 PID: 78 Comm: kworker/2:1 Not tainted
> 3.11.0-15-generic #25-Ubuntu
> [   12.278083] Hardware name: Dell Inc. Inspiron 3737/0C6PRJ, BIOS A07
> 11/12/2013
> [   12.278091] Workqueue: events azx_probe_work [snd_hda_intel]
> [   12.278095]  0000000000000009 ffff880155067d58 ffffffff816e7375
> 0000000000000000
> [   12.278099]  ffff880155067d90 ffffffff81061dcd ffff88015551c228
> 0000000000000000
> [   12.278102]  0000000000000000 ffff88015551c000 0000000000000080
> ffff880155067da0
> [   12.278103] Call Trace:
> [   12.278111]  [<ffffffff816e7375>] dump_stack+0x45/0x56
> [   12.278117]  [<ffffffff81061dcd>] warn_slowpath_common+0x7d/0xa0
> [   12.278121]  [<ffffffff81061eaa>] warn_slowpath_null+0x1a/0x20
> [   12.278145]  [<ffffffffa02a5407>] i915_request_power_well+0x77/0x80 [i915]
> [   12.278152]  [<ffffffffa04beb22>] hda_display_power+0x32/0x40
> [snd_hda_intel]
> [   12.278157]  [<ffffffffa04bd505>] azx_probe_continue+0x45/0x940
> [snd_hda_intel]
> [   12.278162]  [<ffffffff810913c0>] ? finish_task_switch+0x50/0xf0
> [   12.278168]  [<ffffffffa04be8d5>] azx_probe_work+0x15/0x20 [snd_hda_intel]
> [   12.278172]  [<ffffffff8107cfec>] process_one_work+0x17c/0x430
> [   12.278176]  [<ffffffff8107dfac>] worker_thread+0x11c/0x3c0
> [   12.278179]  [<ffffffff8107de90>] ? manage_workers.isra.25+0x2a0/0x2a0
> [   12.278183]  [<ffffffff81084740>] kthread+0xc0/0xd0
> [   12.278187]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
> [   12.278193]  [<ffffffff816f71ac>] ret_from_fork+0x7c/0xb0
> [   12.278197]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
> [   12.278200] ---[ end trace 21db90331deffc67 ]---

This one is the audio driver trying to ask from i915 for its power domain to be
turned on. Sine i915 doesn't init at all, there won't be any power domain
support either. A stop-gap solution would be to refuse loading the audio driver
too in case of nomodeset.

My bet is that BIOS leaves the power well enabled, so this shouldn't have any
side effects besides the WARN.

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