I bought a new PC which has a Coffe Lake Intel i5 8400, with an integrated graphics card Intel Graphics 630.
Once installed Debian 9 with UEFI, I proceeded to correct the screen resolution but I can not change resolution from 1024x768px to 2560x1440px (I can only see one option).
I searched the web for possible solutions but the problem is still there.
Under here I'll paste what I did until now:
Using: Debian 9 with kernel 4.9.0-6-amd64
HW: Intel i5 8400 on H310 chipset, no dedicated graphics card
Video ports available: VGA, HDMI and DVI
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xrandr
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xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
1024x768 76.00*
cvt 2560 1440 60
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# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync
xrandr --newmode "2k_60hz" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync
+
xrandr again
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xrandr: Failed to get size of gamma for output default
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Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
1024x768 76.00*
2k_60hz (0x289) 312.250MHz -HSync +VSync
h: width 2560 start 2752 end 3024 total 3488 skew 0 clock 89.52KHz
v: height 1440 start 1443 end 1448 total 1493 clock 59.96Hz
xrandr --addmode default 2k_60hz
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xrandr --addmode default 2k_60hz
xrandr: Failed to get size of gamma for output default
/etc/default/grub edited as root + update-grub
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GRUB_CMDLINE_LINUX_DEFAULT="i915.alpha_support=1 quiet splash"
Am I missing something? A driver maybe?
Thank you guys.