I have an old graphics card (saphire r9 270x pitcairn architecture) that keeps crashing when under maximum load. the preset stock clock is 1070mhz and it runs fine when underclocked to 1000mhz. I've already enabled amdgpu experimental through:
GRUB_CMDLINE_LINUX_DEFAULT="radeon.cik_support=0 amdgpu.cik_support=1 radeon.si_support=0 amdgpu.si_support=1 amdgpu.ppfeaturemask=0xffffffff radeon.dpm=0 amdgpu.dpm=1"
lspci -nnk | grep -i vga -A3 | grep 'in use'
Kernel driver in use: amdgpu
Clock speeds and voltages are supposed to be changed by overriding GPU's P-states in /sys/class/drm/card0/device/pp_od_clk_voltage and committing it with "c", but when I go in system root folder, I cant find pp_od_clk_voltage in /sys/class/drm/card0/device/. The file is missing. I can only find pp_sclk_od, pp_mclk_od, pp_dpm_sclk and pp_dpm_mclk.
How can I underclock using pp_od_clk_voltage when the file is missing from the system. please, I need help and my English is not very good.
Edit....
i ran this command
ls -l /sys/class/drm/card0/device
/sys/class/drm/card0/device -> ../../../0000:01:00.0
realpath /sys/class/drm/card0/device
/sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0
sudo ls /sys/devices/pci0000\:00/0000\:00\:02.0/0000\:01\:00.0/ | grep pp_od_clk_voltage
"didn't get any output"
it seems like the file is ultimately missing from the system. i can't be sure if it is originally like this or it is my fault.
edit...
i have create the file pp_od_clk_voltage
OD_SCLK:
0: 300MHz 900mV
1: 400MHz 942mV
2: 500MHz 984mV
3: 600MHz 1026mV
4: 700MHz 1068mV
5: 800MHz 1110mV
6: 900MHz 1152mV
7: 1000MHz 1200mV
OD_MCLK:
0: 300MHz 900mV
1: 1000MHz 1050mV
2: 1400MHz 1200mV
OD_RANGE:
SCLK: 300MHz 1000MHz
MCLK: 300MHz 1400MHz
VDDC: 900mV 1200mV
i use mv command
mv pp_od_clk_voltage /sys/devices/pci0000\:00/0000\:00\:02.0/0000\:01\:00.0/
mv: cannot create regular file '/sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/pp_od_clk_voltage': Permission denied
i also use touch and nano by moving to the designated directory
cd /sys/devices/pci0000\:00/0000\:00\:02.0/0000\:01\:00.0/
touch pp_od_clk_voltage
touch: cannot touch 'pp_od_clk_voltage': Permission denied
nano pp_od_clk_voltage
Error writing pp_od_clk_voltage: Permission denied
all of this is done by logging to root account using su command
i have already check the file permission of /sys folder
ls -l
drwxr-xr-x 13 root root 0 Aug 23 23:01 sys
i don't understand why is this happening
