#900877 xserver-xorg-core: Can't use external displays wired via GM107GLM driven by modesetting

Package:
xserver-xorg-core
Source:
xorg-server
Description:
Xorg X server - core server
Submitter:
Sam Morris
Date:
2021-09-22 04:48:16 UTC
Severity:
normal
#900877#5
Date:
2018-06-06 09:44:52 UTC
From:
To:
I'm unable to use external monitors with the modesetting driver on my
Lenovo P50 with 1.20.

The X server logs the following:

    (II) modeset(0): Allocate new frame buffer 5760x2160 stride
    randr: falling back to unsynchronized pixmap sharing
    (EE) modeset(G0): failed to set mode: No such file or directory

... which appears to be caused by:

    getpid()                                = 1410
    getpid()                                = 1410
    ioctl(13, DRM_IOCTL_MODE_SETGAMMA, 0x7ffcce40f3c0) = 0
    ioctl(13, DRM_IOCTL_MODE_SETCRTC, 0x7ffcce40f2b0) = -1 ENOENT (No such file or directory)
    --- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---
    rt_sigreturn({mask=[]})                 = -1 ENOENT (No such file or directory)
    write(2, "(EE) modeset(G0): failed to set "..., 64) = 64

I've switched back to the nouveau driver, which is able to use the
displays, but has other problems with this video card.
#900877#10
Date:
2018-06-06 09:53:22 UTC
From:
To:
I forgot to mention--this is not present in 1.19.6.

Sam
#900877#15
Date:
2021-05-24 21:11:50 UTC
From:
To:
Greeting to you once again



I am writing for the second time as I did not receive any reply from you to
my previous message.



Kindly reply so we can discuss the subject as soon as possible.



Sincerely,



Andy Landman
#900877#20
Date:
2021-09-22 04:25:26 UTC
From:
To:
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