Bug 83605

Summary:

[HD 4400] failed to set mode: Permission denied [13]

Product:

xorg

Reporter:

Ewgenij Starostin <bugs.freedesktop.org>

Component:

Driver/intel

Assignee:

Chris Wilson <chris>

Status:

RESOLVED NOTOURBUG

QA Contact:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Severity:

normal

Priority:

medium

Version:

unspecified

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
Xorg log: switches VTs, black screen, killall’d after five seconds	none
dmesg content from boot until after Xorg termination, drm.debug=0xf	none
output of intel_reg_dumper before running Xorg	none

Description Ewgenij Starostin 2014-09-08 08:52:25 UTC

Created attachment 105883 [details]
Xorg log: switches VTs, black screen, killall’d after five seconds

When starting Xorg on my Thinkpad X240 with Intel HD 4400 graphics, the screen turns black, no cursor, with backlight off and no response to keyboard (VT switch, zap) or X clients’ connection attempts. On killing Xorg, I get back a usable console.

In Xorg.0.log, relevant errors are
[   111.245] (II) intel(0): switch to mode 1920x1080@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[   111.247] (EE) intel(0): failed to set mode: Permission denied [13]
[   111.247] (WW) intel(0): failed to restore desired modes on VT switch
[   111.247] (EE) intel(0): sna_mode_check: invalid state found on pipe 0, disabling CRTC:7

while in dmesg output, there are lines such as
[  111.297648] [drm:i915_gem_execbuffer2] copy 1 exec entries failed 56
and
[  111.366636] [drm:drm_ioctl] pid=3944, dev=0xe200, auth=1, DRM_IOCTL_MODE_SETCRTC
[  111.366637] [drm:drm_ioctl] ret = -13

I use Gentoo, with this error occurring in the same way in two configurations:
(a) Linux 3.16.1 with various third-party patches, Xorg 1.16.0, xf86-video-intel 2.99.914, libdrm 2.4.54, all from the Gentoo repository (USE=sna -uxa; CFLAGS=-O2 -march=core-avx2),
(b) Linux 3.17.0-rc4+, xf86-video-intel 2.99.916 and libdrm 2.4.56 all from their respective git repos, and Xorg 1.16.0 from the Gentoo repository (as above).

I’ve recorded logs by running
intel_reg_dumper >intel_reg1 ; Xorg -logverbose 255 & ( sleep 5 ; intel_reg_dumper >intel_reg2 ; killall Xorg ; intel_reg_dumper >intel_reg3 ; dmesg >dmesg.log )
after a cold boot. The notebook screen was already in its 1920x1080 preferred resolution and no other screen was attached. The configuration files in /usr/share/X11/xorg.conf.d contain only InputDevice sections and there is no configuration directory or file in /etc. The issue occurs every time I attempt to run Xorg.

I’m hoping somebody can provide an insight into what’s wrong. :-)

Comment 1 Ewgenij Starostin 2014-09-08 08:53:29 UTC

Created attachment 105884 [details]
dmesg content from boot until after Xorg termination, drm.debug=0xf

Comment 2 Ewgenij Starostin 2014-09-08 08:56:41 UTC

Created attachment 105885 [details]
output of intel_reg_dumper before running Xorg

Five seconds after starting Xorg, changes in intel_reg_dumper output:
138c138
<                BLC_PWM_CPU_CTL: 0x03530353 (cycle 851, freq 851)
---
>                BLC_PWM_CPU_CTL: 0x0353000a (cycle 10, freq 851)
152,156c152,156
<             RC6_RESIDENCY_TIME: 0x0605bff8
<                  FENCE START 0: 0x00000000
<                    FENCE END 0: 0x00000000
<                  FENCE START 1: 0x00000000
<                    FENCE END 1: 0x00000000
---
>             RC6_RESIDENCY_TIME: 0x06416318
>                  FENCE START 0: 0x00b6d001
>                    FENCE END 0: 0x0135503b
>                  FENCE START 1: 0x01357001
>                    FENCE END 1: 0x01b3f03b

One second after killing Xorg, difference to the initial state (in intel_reg1, before Xorg was started):
152c152
<             RC6_RESIDENCY_TIME: 0x0605bff8
---
>             RC6_RESIDENCY_TIME: 0x064f3640

Comment 3 Chris Wilson 2014-09-08 09:01:56 UTC

systemd/logind passes an fd to X to use, and then promptly removes privileges from that fd for modesetting.


[  111.207166] [drm:drm_ioctl] pid=3778, dev=0xe200, auth=1, DRM_IOCTL_SET_MASTER
[  111.207293] [drm:drm_ioctl] pid=3944, dev=0xe200, auth=1, DRM_IOCTL_SET_VERSION
[  111.207299] [drm:drm_ioctl] pid=3944, dev=0xe200, auth=1, DRM_IOCTL_GET_UNIQUE
[  111.207301] [drm:drm_ioctl] pid=3944, dev=0xe200, auth=1, DRM_IOCTL_GET_UNIQUE
[  111.207305] [drm:drm_ioctl] pid=3944, dev=0xe200, auth=1, DRM_IOCTL_VERSION
[  111.207308] [drm:drm_ioctl] pid=3944, dev=0xe200, auth=1, DRM_IOCTL_VERSION
[  111.288761] [drm:intel_crtc_set_config] [CRTC:7] [FB:40] #connectors=1 (x y) (0 0)
[  111.288765] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:7], mode_changed=0, fb_changed=0
[  111.288767] [drm:intel_modeset_stage_output_state] [CONNECTOR:18:eDP-1] to [CRTC:7]
[  111.288770] [drm:drm_framebuffer_reference] ffff880234cf39c0: FB ID: 40 (3)
[  111.288771] [drm:drm_framebuffer_unreference] ffff880234cf39c0: FB ID: 40 (4)
[  111.288772] [drm:intel_crtc_set_config] [CRTC:11] [NOFB]
[  111.288774] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:11], mode_changed=0, fb_changed=0
[  111.288775] [drm:intel_modeset_stage_output_state] [CONNECTOR:18:eDP-1] to [CRTC:7]
[  111.288777] [drm:drm_framebuffer_reference] ffff880234cf39c0: FB ID: 40 (3)
[  111.288778] [drm:drm_framebuffer_unreference] ffff880234cf39c0: FB ID: 40 (4)
[  111.288778] [drm:intel_crtc_set_config] [CRTC:15] [NOFB]
[  111.288780] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:15], mode_changed=0, fb_changed=0
[  111.288781] [drm:intel_modeset_stage_output_state] [CONNECTOR:18:eDP-1] to [CRTC:7]
[  111.288782] [drm:drm_framebuffer_reference] ffff880234cf39c0: FB ID: 40 (3)
[  111.288783] [drm:drm_framebuffer_unreference] ffff880234cf39c0: FB ID: 40 (4)
[  111.294820] [drm:drm_ioctl] pid=3778, dev=0xe200, auth=1, DRM_IOCTL_DROP_MASTER

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