Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-24 Thread Felix Richter
On 7/20/25 17:45, Alex Deucher wrote: DP (and all of its variants, eDP, USB-C thunderbolt) doesn't actually use i2c directly. It's aux; you can do i2c over aux, but in the case of MST, it's more like a network for displays so naively messing with i2c buses from userspace won't do what you expec

Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-20 Thread Alex Deucher
On Sat, Jul 19, 2025 at 1:38 PM Felix Richter wrote: > > On 7/19/25 14:23, Mario Limonciello wrote: > > > > On 7/19/25 5:10 AM, Felix Richter wrote: > >> Thanks for the reply. > >> > >> I am aware that i can read and `edid` via sysfs from the drm device. > >> I did not know about `drm_info` but fr

Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-19 Thread Mario Limonciello
On 7/19/25 12:02 PM, Felix Richter wrote: On 7/19/25 14:23, Mario Limonciello wrote: On 7/19/25 5:10 AM, Felix Richter wrote: Thanks for the reply. I am aware that i can read and `edid` via sysfs from the drm device. I did not know about `drm_info` but from a quick look at it I don't thi

Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-19 Thread Felix Richter
On 7/19/25 14:23, Mario Limonciello wrote: On 7/19/25 5:10 AM, Felix Richter wrote: Thanks for the reply. I am aware that i can read and `edid` via sysfs from the drm device. I did not know about `drm_info` but from a quick look at it I don't think it provides the information I need. The p

Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-19 Thread Mario Limonciello
On 7/19/25 5:10 AM, Felix Richter wrote: Thanks for the reply. I am aware that i can read and `edid` via sysfs from the drm device. I did not know about `drm_info` but from a quick look at it I don't think it provides the information I need. The problem is not that I need more information

Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-19 Thread Felix Richter
Thanks for the reply. I am aware that i can read and `edid` via sysfs from the drm device. I did not know about `drm_info` but from a quick look at it I don't think it provides the information I need. The problem is not that I need more information about the attached display. The problem is

Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-18 Thread Mario Limonciello
On 7/17/2025 2:42 PM, Felix Richter wrote: Hi, just tested that this Bug still exists in kernel version 6.16-rc6. The example trigger from my previous mail still works triggering screen freezing shortly after invocation. I also learned that setting kernel param `amdgpu.dcdebugmask=0x10` work

Re: Regression: DDC I2C Display Freezing for internal displays

2025-07-17 Thread Felix Richter
Hi, just tested that this Bug still exists in kernel version 6.16-rc6. The example trigger from my previous mail still works triggering screen freezing shortly after invocation. I also learned that setting kernel param `amdgpu.dcdebugmask=0x10` works as a workaround. Kind regards, Felix Ri