[Bug 106467] New: bitten by enable_rc6=0 removal

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106467

            Bug ID: 106467
           Summary: bitten by enable_rc6=0 removal
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: nicholas at mxc.ca
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 139475
  --> https://bugs.freedesktop.org/attachment.cgi?id=139475&action=edit
intel_reg dump

Hi! I have a Lenovo Yoga 910 which required option enable_rc6=0 in order to
avoid screen corruption. With my distro's most recent update, we've picked up
https://patchwork.kernel.org/patch/9644631/ and now I get screen corruption
again. Here's a link to a 10-second video of what my laptop screen looks like: 
 
https://drive.google.com/file/d/1Z7_Ce0NUKZhB9mIXpFFaeuMwXsmroV9m/view?usp=sharing

The screen corruption is intermittent. Having the screen updating, such as
moving the mouse or playing a video on youtube, reduces the effect but it still
flickers about once per second. I haven't seen any corruption when at a VT.

I've tried other settings that exist in the i915 driver but have been unable to
find a workaround.

The link to intel_reg_dumper guide is 404 from
https://01.org/linuxgraphics/documentation/how-report-bugs. I ran 'intel_reg
dump' and attached that.

I was unable to get the video bios dump using the guide at
https://01.org/linuxgraphics/documentation/development/how-dump-video-bios .
The 'cat' step produces an 'input/output error' with a zero-byte file. (If I
try cat after echo 0, I get an invalid argument error instead.) Let me know if
you want an strace of the cat. This also produced errors in dmesg, the echo
produced "Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff" while
the cat produced "Invalid mmio detected during user access".

Debian unstable/sid, xserver-xorg-video-intel package is version
"2:2.99.917+git20171229-1", kernel is "4.16.5-1 (2018-04-29)".

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