Radeon HD 4250: how to get 2560 x 1440 resolution

Hello,
I’ve a new monitor (Philips E 275E2) and I want to use 2560 x 1440 .
My graphic card supports 25601600 @60Hz on DVI-D port.
I’m stuck on 1980x1080 :
xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA-0 disconnected primary (normal left inverted right x axis y axis)
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
1920x1080 60.00
50.00 59.94
1920x1080i 60.00 50.00 59.94
1280x1440 59.91
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08

I’ve tried to add several linemode with xrandr:
xrandr --newmode “2560x1440_55.00” 284.00 2560 2744 3016 3472 1440 1443 1448 1489 -hsync +vsync
xrandr --newmode “2560x1440_50.00” 256.25 2560 2736 3008 3456 1440 1443 1448 1484 -hsync +vsync
xrandr --newmode “2560x1440_60.00” 241.500 2560 2752 1440 1443 -hsync +vsync
xrandr --newmode “1920x1080_75.00” 220.75 1920 2064 2264 2608 1080 1083 1088 1130 -hsync +vsync
xrandr --newmode “1920x1080_60.00” 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
xrandr --newmode “2560x1440_55.00” 281.43 2560 2752 3024 3448 1440 1443 1448 1484 +hsync +vsync
xrandr --newmode “2560x1440_55.00” 281.43 2560 2752 3024 3448 1440 1443 1448 1484 -hsync +vsync
xrandr --newmode “2560x1440_55.00” 281.43 2560 2752 3024 3448 1440 1443 1448 1484 -hsync +vsync
xrandr --newmode “2560x1440_55.00b” 281.43 2560 2752 3024 3448 1440 1443 1448 1484 -hsync +vsync
xrandr --newmode “2560x1440_55.00c” 283.13 2560 2752 3024 3448 1440 1443 1448 1493 -hsync +vsync
xrandr --newmode “2560x1440R” 283.13 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync
xrandr --newmode “2560x1440R” 241.5 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync
xrandr --newmode “2560x1440R2” 241.5 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync

The result is always a black screen with the message “searching”

Here’s the edid-decode:
edid-decode /sys/class/drm/card0-HDMI-A-1/edid
edid-decode (hex):

00 ff ff ff ff ff ff 00 41 0c 3a c2 bf 0d 00 00
10 1f 01 03 80 3c 22 78 2a d6 e5 ac 52 4e a0 25
0e 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 81 40
81 c0 01 01 01 01 56 5e 00 a0 a0 a0 29 50 30 20
35 00 55 50 21 00 00 1e 00 00 00 ff 00 55 48 42
32 31 31 36 30 30 33 35 31 39 00 00 00 fc 00 50
48 4c 20 32 37 35 45 32 46 0a 20 20 00 00 00 fd
00 30 4b 1e 72 1e 00 0a 20 20 20 20 20 20 01 4c

02 03 29 f1 4b 10 1f 05 14 04 13 03 12 02 11 01
23 09 07 07 83 01 00 00 67 03 0c 00 20 00 00 3c
68 1a 00 00 01 01 30 4b e6 a0 73 00 6a a0 a0 29
50 08 20 35 00 55 50 21 00 00 1a 2a 44 80 a0 70
38 27 40 30 20 35 00 55 50 21 00 00 1a 02 3a 80
18 71 38 2d 40 58 2c 45 00 55 50 21 00 00 1e f0
3c 00 d0 51 a0 35 50 60 88 3a 00 55 50 21 00 00
1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00 17


Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: PHL
Model: 49722
Serial Number: 3519
Made in: week 16 of 2021
Basic Display Parameters & Features:
Digital display
Maximum image size: 60 cm x 34 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
First detailed timing is the preferred timing
Color Characteristics:
Red : 0.6748, 0.3212
Green: 0.3056, 0.6269
Blue : 0.1474, 0.0566
White: 0.3134, 0.3291
Established Timings I & II:
IBM : 720x400 70.082 Hz 9:5 31.467 kHz 28.320 MHz
DMT 0x04: 640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz
Apple : 640x480 66.667 Hz 4:3 35.000 kHz 30.240 MHz
DMT 0x05: 640x480 72.809 Hz 4:3 37.861 kHz 31.500 MHz
DMT 0x06: 640x480 75.000 Hz 4:3 37.500 kHz 31.500 MHz
DMT 0x08: 800x600 56.250 Hz 4:3 35.156 kHz 36.000 MHz
DMT 0x09: 800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz
DMT 0x0a: 800x600 72.188 Hz 4:3 48.077 kHz 50.000 MHz
DMT 0x0b: 800x600 75.000 Hz 4:3 46.875 kHz 49.500 MHz
Apple : 832x624 74.551 Hz 4:3 49.726 kHz 57.284 MHz
DMT 0x10: 1024x768 60.004 Hz 4:3 48.363 kHz 65.000 MHz
DMT 0x11: 1024x768 70.069 Hz 4:3 56.476 kHz 75.000 MHz
DMT 0x12: 1024x768 75.029 Hz 4:3 60.023 kHz 78.750 MHz
DMT 0x24: 1280x1024 75.025 Hz 5:4 79.976 kHz 135.000 MHz
Standard Timings:
DMT 0x52: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz
DMT 0x3a: 1680x1050 59.954 Hz 16:10 65.290 kHz 146.250 MHz
DMT 0x2f: 1440x900 59.887 Hz 16:10 55.935 kHz 106.500 MHz
DMT 0x23: 1280x1024 60.020 Hz 5:4 63.981 kHz 108.000 MHz
DMT 0x20: 1280x960 60.000 Hz 4:3 60.000 kHz 108.000 MHz
DMT 0x55: 1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz
Detailed Timing Descriptors:
DTD 1: 2560x1440 59.951 Hz 16:9 88.787 kHz 241.500 MHz (597 mm x 336 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol P
Display Product Serial Number: ‘UHB2116003519’
Display Product Name: ‘PHL 275E2F’
Display Range Limits:
Monitor ranges (GTF): 48-75 Hz V, 30-114 kHz H, max dotclock 300 MHz
Extension blocks: 1
Checksum: 0x4c


Block 1, CTA-861 Extension Block:
Revision: 3
Underscans IT Video Formats by default
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
Native detailed modes: 1
Video Data Block:
VIC 16: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz
VIC 31: 1920x1080 50.000 Hz 16:9 56.250 kHz 148.500 MHz
VIC 5: 1920x1080i 60.000 Hz 16:9 33.750 kHz 74.250 MHz
VIC 20: 1920x1080i 50.000 Hz 16:9 28.125 kHz 74.250 MHz
VIC 4: 1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz
VIC 19: 1280x720 50.000 Hz 16:9 37.500 kHz 74.250 MHz
VIC 3: 720x480 59.940 Hz 16:9 31.469 kHz 27.000 MHz
VIC 18: 720x576 50.000 Hz 16:9 31.250 kHz 27.000 MHz
VIC 2: 720x480 59.940 Hz 4:3 31.469 kHz 27.000 MHz
VIC 17: 720x576 50.000 Hz 4:3 31.250 kHz 27.000 MHz
VIC 1: 640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz
Audio Data Block:
Linear PCM:
Max channels: 2
Supported sample rates (kHz): 48 44.1 32
Supported sample sizes (bits): 24 20 16
Speaker Allocation Data Block:
FL/FR - Front Left/Right
Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
Source physical address: 2.0.0.0
Maximum TMDS clock: 300 MHz
Vendor-Specific Data Block (AMD), OUI 00-00-1A:
Version: 1.1
Minimum Refresh Rate: 48 Hz
Maximum Refresh Rate: 75 Hz
Flags 1.x: 0xe6 (MCCS)
Detailed Timing Descriptors:
DTD 2: 2560x1440 74.968 Hz 16:9 111.028 kHz 296.000 MHz (597 mm x 336 mm)
Hfront 8 Hsync 32 Hback 66 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol N
DTD 3: 1920x1080 74.973 Hz 16:9 83.894 kHz 174.500 MHz (597 mm x 336 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 31 Vpol N
DTD 4: 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (597 mm x 336 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 4 Vsync 5 Vback 36 Vpol P
DTD 5: 1280x1440 59.913 Hz 8:9 89.450 kHz 156.000 MHz (597 mm x 336 mm)
Hfront 96 Hsync 136 Hback 232 Hpol N
Vfront 3 Vsync 10 Vback 40 Vpol P
Checksum: 0x17

Any help would be appreciated.

What you posted shows 2 modes for that resolution, and DTD 1 is the preferred. All you should need to do is use xrandr to set the corresponding values. This all supposes the driver for the card supports it. You said the card is supposed to support that, but does the driver?

Detailed Timing Descriptors:
DTD 1: 2560x1440 59.951 Hz 16:9 88.787 kHz 241.500 MHz (597 mm x 336 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol P

Detailed Timing Descriptors:
DTD 2: 2560x1440 74.968 Hz 16:9 111.028 kHz 296.000 MHz (597 mm x 336 mm)
Hfront 8 Hsync 32 Hback 66 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol N

I don’t know how to get this information.
The driver is radeon:
lshw -C display
*-display
description: VGA compatible controller
product: RS880 [Radeon HD 4250]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 5
bus info: pci@0000:01:05.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm msi vga_controller bus_master cap_list
configuration: driver=radeon latency=0
resources: irq:18 memory:d0000000-dfffffff ioport:e000(size=256) memory:ff300000-ff30ffff memory:ff200000-ff2fffff memory:c0000-dffff

And then?
I need help

I’m assuming you’re using Xorg. Please put your /var/log/Xorg.0.log and dmesg on https://paste.centos.org/ and link here.

Here is the link: /var/log/X.0.log and dmesg - Pastebin Service