Several LightningChart .NET users have reported us experiencing technical issues with rendering when using Intel® Arc™ or Iris® Xe Graphics. Particularly, when the default Rendering Engine is used (which is based on DirectX 11), the chart could freeze, be very slow and even crash.

We detected one type of setting, which led to the above chart behavior. Whenever LightningChart is asked to render antialiased Line width=1px, the application will freeze, if it is using Iris® Xe graphic DirectX11 drivers.

This type of line could be set for PolygonSeries.Border, Annotation.BorderLineStyle, SampleDataSeries.LineStyle, PointLineSeries.LineStyle, FreeformPointLineSeries.LineStyle etc.

Latest update (March 31st, 2023). Intel® confirmed bug for 11th and 12th Gen. CPU [Arc™ & Iris® Xe Graphics] (bug ID 18024142888).

Issue offically resolved and closed by Intel, and we could confirm that in our test starting from drivers version 31.0.101.4091 problem is not manifesting anymore. It is usually recomended to get drivers update from computer manufacture page/channel, but everybody could install beta drivers from here.

Those LightningChart .NET users, who don’t want or could not updated graphic drivers, could mitigate the above rendering problem with a few simple steps. There are 4 workarounds available:

Solutions

First: set different anti-aliasing rules to be used, Chart.ChartRenderOptions.LineAAType2D = LineAntiAliasingType.QLAA (in WindowsForms RenderOptions).

[The default ALAA is the one that fails on Iris Xe. In theory, QLAA should be a little bit slower than ALAA type anti-aliasing, but in most cases it is insignificant.]

Second: disable anti-aliasing in the chart, Chart.ChartRenderOptions.AntiAliasLevel=0.

[This is maybe easy to set, but all lines will be aliased – will not look very nice.]

Third: change each ‘problematic’ object (e.g. PolygonSeries.Border): no antialiased 1px line. Either width should be 1.01 (instead 1), or LineStyle.AntiAliasing= LineAntialias.None (instead of ‘Normal’).

Fourth: set LightningChart .NET to use different than default drivers (or Rendering Engine). It would be done by setting Chart.ChartRenderOptions.DeviceType (in WindowsForms RenderOptions) to the SoftwareOnlyD11 option.

[SoftwareOnlyD11 rendering could be slower for the demanding application.]

Lately, in 2023, we started to get new kinds of reports about LightningChart behavior in those new Intel computers. The chart may blink or not render at all if other than the default rendering device (or Rendering Engine) is used.

In particular, by setting Chart.ChartRenderOptions.DeviceType (in WindowsForms RenderOptions) for the AutoPreferD9 or the HardwareOnlyD9 option (DirectX 9).

We are investigating the issue and will update you as soon as we learn more.

If you need further assistance, don’t hesitate to get in touch with us through the customer portal or by email.