Bug 255841

Summary:	udev-135 seems to break direct rendering
Product:	Gentoo Linux	Reporter:	Donnie Berkholz (RETIRED) <dberkholz>
Component:	[OLD] Core system	Assignee:	udev maintainers <udev-bugs>
Status:	RESOLVED OBSOLETE
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	254616
Attachments:	emerge --info

Description Donnie Berkholz (RETIRED) gentoo-dev

2009-01-21 23:23:30 UTC

In older udev versions, being in the video group would get you direct rendering. Here's what changed:

comet $ grep -r 'card\[' udev-13*
udev-133/rules/rules.d/50-udev-default.rules:KERNEL=="card[0-9]*",		NAME="dri/%k", MODE="0666"
udev-135/rules/rules.d/50-udev-default.rules:KERNEL=="card[0-9]*",		NAME="dri/%k", MODE="0666"
comet $ grep -r 'card\*' udev-13*
udev-133/rules/gentoo/40-video.rules:KERNEL=="card*",	GROUP="video"

I see that the new one claims to go for a 666 mode, but /dev/dri/card0 is actually 660 root:root here so I can't get direct rendering.

Comment 1 Matthias Schwarzott gentoo-dev

2009-01-22 16:44:35 UTC

So what were the permissions of /dev/dri/card* before and after the update. ls -l output should be fine.
What exact udev versions did you test?
And please attach emerge --info

Comment 2 Donnie Berkholz (RETIRED) gentoo-dev

2009-01-22 19:20:33 UTC

udev-135-r3
--------------

comet $ ls -l /dev/dri/card0 
crw-rw---- 1 root root 226, 0 2009-01-21 15:01 /dev/dri/card0


udev-133
--------------

comet $ ls -l /dev/dri/card0 
crw-rw-rw- 1 root video 226, 0 2009-01-21 15:01 /dev/dri/card0

Comment 3 Donnie Berkholz (RETIRED) gentoo-dev

2009-01-22 19:21:13 UTC

Created attachment 179368 [details]
emerge --info

Comment 4 Donnie Berkholz (RETIRED) gentoo-dev

2009-01-22 19:25:19 UTC

It looks like X munges permissions from 666 to 660 on restart, so the video group is really the key.

Comment 5 Matthias Schwarzott gentoo-dev

2009-01-23 09:50:57 UTC

So we should be fine after adding this line to 65-permissions.rules, correct?

# /dev/dri/card*
KERNEL=="card*",   GROUP="video"

Comment 6 Donnie Berkholz (RETIRED) gentoo-dev

2009-01-23 22:41:56 UTC

(In reply to comment #5)
> So we should be fine after adding this line to 65-permissions.rules, correct?
> 
> # /dev/dri/card*
> KERNEL=="card*",   GROUP="video"

I tested this and it worked great, so yes.

Comment 7 Matthias Schwarzott gentoo-dev

2009-01-24 20:59:22 UTC

Upstream added this rule:
SUBSYSTEM=="drm",		GROUP="video"

https://bugs.launchpad.net/bugs/317430

This will be added to udev-135-r4 then.

Comment 8 Matthias Schwarzott gentoo-dev

2009-01-24 21:14:49 UTC

Fixed in udev-135-r4.

Comment 9 Donnie Berkholz (RETIRED) gentoo-dev

2009-01-27 06:26:28 UTC

Works for me