On Mon, Sep 20, 2010 at 08:59:00AM -0400, Andy Walls wrote:
DRM KMS polling of connections providing errant EDID responses, or polling of "connectors" that have chips responding on DDC I2C bus address 0xA0/0xA1 with no actual physical connector nor EDID EEPROM, will create perpetual noise in dmesg and the system log every 10 seconds. Currently the user has apparently little recourse to silence these messages aside from replacing the offending cable, monitor, or graphics adapter. That recourse is impossible for an unused DVI-D "connector" of an internal graphics processor on a motherboard that provides no physical DVI-D connector.
This change allows the root user to disable (and re-enable) DRM KMS connector polling on a per connector basis via sysfs, like so:
# cat /sys/class/drm/card0/card0-DVI-D-1/polled [hotplug_detectable] connect disconnect # echo > /sys/class/drm/card0/card0-DVI-D-1/polled # cat /sys/class/drm/card0/card0-DVI-D-1/polled hotplug_detectable connect disconnect # echo " connect hotplug_detectable " > \ /sys/class/drm/card0/card0-DVI-D-1/polled # cat /sys/class/drm/card0/card0-DVI-D-1/polled [hotplug_detectable] [connect] disconnect # echo > /sys/class/drm/card0/card0-DVI-D-1/polled # cat /sys/class/drm/card0/card0-DVI-D-1/polled hotplug_detectable connect disconnectwith the enabled poll types for the connector denoted in brackets: []. This allows the root user to silence DRM KMS log spam for locally known uncorrectable conditions.
Signed-off-by Andy Walls awalls@md.metrocast.net
You are adding a sysfs file, yet you forgot to add a file in Documentation/ABI. Please fix that and resend the patch.
thanks,
greg k-h