[Nouveau] [Bug 107919] New: RandR unable to set Screen Size when using Intel+nouveau

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107919

            Bug ID: 107919
           Summary: RandR unable to set Screen Size when using
                    Intel+nouveau
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: main.haarp at gmail.com
        QA Contact: xorg-team at lists.x.org

I am using a Thinkpad W530 which features an Intel GPU (Ivy Bridge) hooked up
to the internal LCD and an Nvidia K2000M (NVE7/GK107) hooked up to the
DisplayPorts.

Gentoo Linux
Kernel: 4.14.65
xorg-server-1.19.5
xf86-video-intel-2.99.917_p20180214
xf86-video-nouveau-1.0.15


Both GPUs drive outputs via "xrandr --setprovideroutputsource nouveau Intel".
Under these conditions, changing monitor layouts works once. Then, when the
laptop is suspended and brought to a different workplace with a different
monitor layout, most subsequent xrandr calls fail. RRSetScreenSize refuses to
work. Example:

    xrandr --output LVDS1 --mode 1920x1080 --pos 0x0 --rotate normal
    xrandr --output DP-1-2 --primary --mode 2560x1440 --pos 1920x0 --rotate
normal
    xrandr --output DP-1-3 --mode 2560x1440 --pos 4480x0 --rotate normal

Result:

X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  139 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Value in failed request:  0x0
  Serial number of failed request:  57
  Current serial number in output stream:  58


Once this bug appears, xrandr behaves pretty strangely and "randomly" as far as
requested changes go:

- xrandr refuses to set some modes/positions/rotations
- This can be partially mitigated by toggling outputs off entirely and on
again. xrandr will still complain, but do as told
- Trying many different modes/positions/rotations and off/on cycles may
eventually yield the desired layout
- Attempts to change the screen size directly with e.g. "xrandr --db 9999x9999"
fails with the same error
- Something simple like making an active output primary, e.g. "xrandr --output
DP-1-2 --primary" fails with the same error
- Setting the same layout that is currently active is also complained about
- xrandr calls that previously failed may suddenly work after waiting a few
hours

Neither the kernel nor X show any relevant logs. I will check other debug
levels as instructed.

If you would like me to test anything or need more information, please let me
know.
Thanks!

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