Created attachment 194383 [details] Seen on git master for Plasma 6.8 on KDE Linux STEPS TO REPRODUCE 1. Have multiple monitors 2. navigate to System Settings > Display Configuration 3. Click "Identify screens" OBSERVED RESULT At least one of them will display hexadecimal numbers somewhere in the identification overlay EXPECTED RESULT All numbers are formatted base-10. Or, maybe no numbers at all, if they aren't necessary for identification? SOFTWARE/OS VERSIONS Operating System: KDE Linux 2026-07-13 KDE Plasma Version: 6.7.80 KDE Frameworks Version: 6.29.0 Qt Version: 6.11.1 Kernel Version: 7.1.3-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 7840U w/ Radeon™ 780M Graphics Memory: 17 GB of RAM (16.0 GB usable) Graphics Processor: AMD Radeon 780M Graphics Also affects other OSs and older Plasma versions too; at least as far back as Plasma 6.6. on Kubuntu.
Created attachment 194384 [details] Seen on Plasma 6.6.5 for Kubuntu
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/9655
Git commit 89eee11ef3185136db92113abe37e92c4bd34aeb by Vlad Zahorodnii, on behalf of Marco Martin. Committed on 28/07/2026 at 07:58. Pushed by vladz into branch 'master'. effects/outputlocator: User friendly name for the internal screen On internal screens, call internal screens "Built-in Screen" in the osd, in order to have the exact same nomenclature that KScreen uses M +3 -0 src/plugins/outputlocator/outputlocator.cpp https://invent.kde.org/plasma/kwin/-/commit/89eee11ef3185136db92113abe37e92c4bd34aeb
Created attachment 194742 [details] Correct indentification found in KCM
Created attachment 194743 [details] Incorrect of identification of exact same monitor in OSD This is the same as monitor as shown in ident-kcm-correct.jpg. The identifier is 91968 but converted to hex (0x0016740)
Created attachment 194745 [details] Confirmation that 0x00016740 is the conversion of 91968 This confirms that the output label on the OSD takes the number 91968 found in the EDID model output and converts it to HEX before presentation. The conclusion is this is likely just string handling mistake, where whatever is outputing the QSTRING is converting the decimal number to hex. The panels that have letters in their model name do not appear to suffer from this.
I have confirmed the panel name presented in this case is pulled from these EDID fields: cat /sys/class/drm/card0-HDMI-A-1/edid |edid-decode \ | grep '\(Display Product\|Serial Number\)' |sort; #> Display Product Name: 'LG Ultra HD' #> Serial Number: 91968 The correct presentation name in System Setting looks to be: STRING('LG Ultra HD') + ' ' + STRING('91968') The INCORRECT presentation name in the OSD appears to be: STRING(LG Ultra HD') + ' ' + HEX('91968') I hope that is helpful.
Created attachment 194747 [details] hobby display I can confirm that I get this on my hobby display
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/9685
The hexadecimal fallback occurs in libdisplay, not just for the serial number but also, in some cases for the monitor name. At least three projects are involved here, libkscreen for example implements its own separate EDID decoder and output logic. I've tried to make the resulting strings look consistent in MR 9685.
This is a KWin issue, KScreen implements its own logic. You can test this even on a single display by triggering the OSD via D-Bus: qdbus6 org.kde.KWin /org/kde/KWin/Effect/OutputLocator1 org.kde.KWin.Effect.OutputLocator1.show
Fixed by David Wild with https://invent.kde.org/plasma/kwin/-/merge_requests/9685, which will be in Plasma 6.6.7, 6.7.5, and 6.8.0. Thanks David!
Git commit d7f16bceb8572f0459650e221a84f585743defdf by Nate Graham. Committed on 05/08/2026 at 15:14. Pushed by vladz into branch 'Plasma/6.6'. utils/edid: fix hexadecimal strings in output names KWin uses libdisplay-info to decode EDID data. di_info_get_model() and di_info_get_serial() fall back to hexadecimal values when no Display Product Name or Serial Number descriptor is found. This patch stops using those helpers and instead implements a direct descriptor parser, similar to libkscreen's decoder: we still fall back to a decimal value for the serial number, but not for the model, so m_monitorName is left empty if no name descriptor exists. To avoid showing "unknown" when m_monitorName is empty, DrmConnector::modelName() now skips empty values instead of concatenating them (similar to libkscreen). Note: if necessary a decimal fallback for the model (m_monitorName) could be added later in the same way. Currently, the model falls back to a hexadecimal representation, but libkscreen has none either, so this patch leaves it out for now. FIXED-IN: 6.6.7 (cherry picked from commit 495d442585e255e7bb7f3e2d570ff2a881d53ce5) 2d916723 utils/edid: fix hexadecimal strings in output names 65a24935 drm_connector: avoid showing "unknown" when m_monitorName is empty Co-authored-by: David Wild <davidwild@gmx.com> M +3 -0 src/backends/drm/drm_connector.cpp M +19 -4 src/utils/edid.cpp https://invent.kde.org/plasma/kwin/-/commit/d7f16bceb8572f0459650e221a84f585743defdf