Re: xrandr fails after resume from hibernation in kernels 4.7.4 and 4.8.0

[Gaston Gonzalez]

On Wed, Oct 05, 2016 at 07:23:23AM +0200, Greg KH wrote:
> On Tue, Oct 04, 2016 at 08:43:03PM -0300, Gaston Gonzalez wrote:
> > Hi,
> > 
> > After hibernation I get the following error when I tried to connect to monitor
> > through hdmi:
> > 
> > $ xrandr --output LVDS1 --off  --output  HDMI1 --auto
> > xrandr: Configure crtc 1 failed
> > 
> > This does not happen in kernel in kernel v4.6.7 but do happen in kernels v4.7.4
> > and v4.8.0
> 
> Ah, can you use 'git bisect' to track down the offending patch?
> 
> Also, if you let the graphics driver authors know, they are probably the
> best ones to help out with this, not the "generic" stable mailing list.
> 
> thanks,
> 
> greg k-h

Hello,

The culprit commit seems to be:

commit: ed4a6a7
drm/i915: Add two-stage ILK-style watermark programming

Attached the bisection log.

Let me know if additional test or bisect is needed.

Best regards,

Gaston
git bisect start '--' 'drivers/gpu/drm/'
# good: [096998b11906dd79df5af4d688c9974342dd09f2] Linux 4.6.7
git bisect good 096998b11906dd79df5af4d688c9974342dd09f2
# bad: [c8d2bc9bc39ebea8437fd974fdbc21847bb897a3] Linux 4.8
git bisect bad c8d2bc9bc39ebea8437fd974fdbc21847bb897a3
# good: [2dcd0af568b0cf583645c8a317dd12e344b1c72a] Linux 4.6
git bisect good 2dcd0af568b0cf583645c8a317dd12e344b1c72a
# bad: [3c85f20a289d044f303f473ee6ab7502303fc3b0] Merge tag 'omapdrm-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux into drm-next
git bisect bad 3c85f20a289d044f303f473ee6ab7502303fc3b0
# bad: [a64424d722504926f3375bc4887976e3bfe3a01d] Merge branch 'drm-next-4.7' of git://people.freedesktop.org/~agd5f/linux into drm-next
git bisect bad a64424d722504926f3375bc4887976e3bfe3a01d
# bad: [b5bf0f1ea3658254bd72ef64abc97786e8a32255] drm/exynos: clean up register definions for fimd and decon
git bisect bad b5bf0f1ea3658254bd72ef64abc97786e8a32255
# bad: [27878ede4fec7b929c3010710ba4d55c617c621d] drm/i915: Throw out BUGs from DPLL/PCH functions
git bisect bad 27878ede4fec7b929c3010710ba4d55c617c621d
# bad: [72341af4285ae1337c0dfdfa3e68318b52b8757c] drm/i915: hide away VBT private data in a separate header
git bisect bad 72341af4285ae1337c0dfdfa3e68318b52b8757c
# bad: [71f0a626143368b8aead361ffaff7e36d043fd8e] drm/i915: Only use sanitized values for ILK watermarks
git bisect bad 71f0a626143368b8aead361ffaff7e36d043fd8e
# bad: [66e2c4c39cc37beaccc24c9d14c75d627fce9cf4] drm/i915/gen9: Disable DC states if power well support is disabled
git bisect bad 66e2c4c39cc37beaccc24c9d14c75d627fce9cf4
# bad: [4f2d9934bd6ac73950832c96b385822846670668] drm/i915: Pass drm_frambuffer to intel_compute_page_offset()
git bisect bad 4f2d9934bd6ac73950832c96b385822846670668
# bad: [1d5bf5d9d9ef0c1e639d36178a224d83888c5a29] drm/i915: Add missing NULL check before calling initial_watermarks
git bisect bad 1d5bf5d9d9ef0c1e639d36178a224d83888c5a29
# bad: [d9f8e52b22454a30aaaf26b7ef029598b30abf8e] drm/i915: remove dead code
git bisect bad d9f8e52b22454a30aaaf26b7ef029598b30abf8e
# bad: [c3454d575da162cd310d9b83696baefb29d10a70] drm/i915: remove left over dead code
git bisect bad c3454d575da162cd310d9b83696baefb29d10a70
# bad: [ed4a6a7ca853253f9b86f3005d76345482a71283] drm/i915: Add two-stage ILK-style watermark programming (v11)
git bisect bad ed4a6a7ca853253f9b86f3005d76345482a71283
# first bad commit: [ed4a6a7ca853253f9b86f3005d76345482a71283] drm/i915: Add two-stage ILK-style watermark programming (v11)