[Bug 67591] New: Mouse is displayed in portion of screen only in v3.13-rc3 ... -rc5

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=67591

            Bug ID: 67591
           Summary: Mouse is displayed in portion of screen only in
                    v3.13-rc3 ... -rc5
           Product: Drivers
           Version: 2.5
    Kernel Version: v3.13-rc3 ... -rc5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: andre.muller at web.de
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

The X (hardware) cursor is often not displayed.
The cursor is only displayed at all in a rectangle that looks
suspiciously to be 640x480 in size, located in the top left.
There are other restrictions, though.
The cursor is never displayed but in the leftmost terminal or below it.
But not below a second terminal to the right.
When closing that second terminal, the 640x480 visibility is restored.

There is a warning in the dmesg:

[...]
[    0.321336] [drm] Wrong MCH_SSKPD value: 0x16040307
[    0.321342] [drm] This can cause pipe underruns and display issues.
[    0.321344] [drm] Please upgrade your BIOS to fix this.
[    0.382191] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit
banging on pin 5
[...]

The BIOS has the latest available firmware though.

Linux-3.12 is fine, also this warning does not show.
Anything below 3.12, as well as stable until 3.12.6 are fine.

I have found this error present in 3.13-rc3 and -rc5,
but have not yet tried to further narrow it down.

Some info on the system:

Lenovo Thinkpad T420,
that is sandybridge with intel integrated graphics.
UEFI firmware v 1.46 83ET76WW
The Kernel boots directly from EFI, untroubled by bootloaders.

The .config, the dmesg and lspci -vvv outputs are attached.

I will happily provide further info.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.